Even if the cracks or holes may be very small they could still affect the quality of the tile and make it less durable during storms or strong winds.
Porous lead roof.
In roof tiling and slating the author rejects this cautious approach.
Due to its durability and strength lead is a popular material for roof and chimney flashings.
Understandably when you re dealing with a concrete roof this is a big concern because they are so exposed to the elements the last thing you want to happen is to have your concrete tiles fall off your roof.
Weather deterioration loose fixings and movement can result in roof leaks.
When a hot roof surface is suddenly cooled by rain the pressure in the area between the vapour barrier and roof covering can fall below atmospheric.
The more holes there are the more water can start to absorb and leak through your tiles with less difficulty.
Lead is commonly used for flat roofs because of it s long life and ability to be formed to fit many positions lead must be laid and formed correctly to achieve this long life however.
For those who don t know porous in this case means the concrete roof tiles will let water through.
Traditionally 30 felt was used at eaves as insurance against this problem.
Http www fixmyroof co uk flat roof repair need a new flat roof.
More about lead as a building material.
Porous roof tiles can break more easily.
Porous roof tiles are weaker.
Given that porous roof tiles are weaker than tiles that aren t suffering from the same.
Compare them here.
Correctly laid lead roof greyfriars roofing note the height of steps between bays the rolled joints and adequate overlaps problems.
This is something that may be expected.
A porous tile on itself cannot be as strong as a tile in a good and solid condition.
As the porosity of your tiles increase it means more and more little holes will fill the entirety of your tiles.
Porous tiles lead to leaks.
Just a couple of damaged or missing tiles or slates will quickly allow water to penetrate a building s fabric resulting in damage to the timbers and ceilings below.
However over time damage can occur.
Acrylic sealants have similar disadvantages where butyl rubber sealants have the opposite effect that over a period of time become hard and brittle but.
Where such a problem is left unattended it will ultimately lead to widespread rot and decay.
Whether you re renovating a house or just performing an exterior health check ignoring a poorly maintained roof can be disastrous.
Investigative work carried out on warm roofs covered in lead has shown that in rare instances moisture can also be introduced by the development of sub atmospheric pressure in the roof space.
If there are porous slates or openings above the tears in the felt water may leak through.
